The Migration Rule of Pb Content Transported from Different Sources

摘要

According to the survey materials of the waters of Jiaozhou Bay in May, September and October 1993, this article studied the content of Pb and its horizontal distribution in the surface water bodies. The results showed that the Pb content in the waters of Jiaozhou Bay ranged within 0.62 - 3.05 μg/L, which conformed to the seawater standard of Class I and II. And it also indicated that in terms of the Pb content, the water bodies of Jiaozhou bay were mildly contaminated by Pb content in May, September and October. The Pb content in Jiaozhou bay mainly had three sources, the transportation of rivers, surface runoff and offshore ocean currents. The Pb content was 2.13 μg/L transported from the rivers, 2.74 μg/L from the surface runoff and 3.05 μg/L from the offshore ocean currents. It demonstrated that the transportation of rivers, surface runoff and offshore ocean currents had been moderated polluted by Pb content. Three different migration paths of Pb content, from land, ocean to Jiaozhou Bay water bodies, have been expressed in model block diagram. In the migration process of Pb content transported from different sources, the author found out the migration rules: 1) the Pb content was continuously decreased with the extension of migration distance;2) the Pb content in the ocean water body was very high with the accumulation of Pb content in the ocean.